From f1bf741b514215e252b40d7da5cb77a6e86ffc19 Mon Sep 17 00:00:00 2001
From: AndreasMeier12 <43337403+AndreasMeier12@users.noreply.github.com>
Date: Tue, 3 Feb 2026 10:18:17 +0100
Subject: [PATCH] Make subClass property optional

---
 0.2.x/spec.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/0.2.x/spec.md b/0.2.x/spec.md
index 9ba97d6..f8572a4 100644
--- a/0.2.x/spec.md
+++ b/0.2.x/spec.md
@@ -137,7 +137,7 @@ Based on RDFS classes, these can be used as object and subjects of triples.
 | @id                 | MUST      | ID of the entry                                                                                                                                   |
 | @type               | MUST      | Is `rdfs:Class`                                                                                                                                   |
 | owl:equivalentClass | MAY       | Ontological annotation  https://www.w3.org/TR/owl-ref/#equivalentClass-def                                                                        |
-| rdfs:subClassOf     | MUST      | Used to indicate inheritance. Each entry has to inherit from something, this can be a base type.  https://www.w3.org/TR/rdf-schema/#ch_subclassof |
+| rdfs:subClassOf     | MAY      | Used to indicate inheritance. Each entry has to inherit from something, this can be a base type.  https://www.w3.org/TR/rdf-schema/#ch_subclassof |
 | rdfs:label          | MAY       | Label of the class                                                                                                                                |
 | rdfs:comment        | MAY       | Human-readable description of this class                                                                                                          |
 | owl:restriction     | MAY       | OWL restriction, a list of OWL restrictions, see [OWl Restriction](#owl-restriction)                                                              |